async.coffee

Promise = require 'bluebird'
co = require 'co'

# Callbacks

wait = (n, cb) ->
  setTimeout ->
    cb null, n
  , 1000

wait 1, (err, res) ->
  console.log "Callback - #{res}"
  wait 2, (err, res) ->
    console.log "Callback - #{res}"
    wait 3, (err, res) ->
      console.log "Callback - #{res}"

# Promises

Promise.resolve(Promise.delay(1000).then -> 1).then( (res) ->
  console.log "Promise - #{res}"
  Promise.resolve(Promise.delay(1000).then -> 2)
).then( (res) ->
  console.log "Promise - #{res}"
  Promise.resolve(Promise.delay(1000).then -> 3)
).then (res) ->
  console.log "Promise - #{res}"

# Generators

co(->
  res = yield Promise.resolve(Promise.delay(1000).then -> 1)
  console.log "Yield - #{res}"
  res = yield Promise.resolve(Promise.delay(1000).then -> 2)
  console.log "Yield - #{res}"
  res = yield Promise.resolve(Promise.delay(1000).then -> 3)
  console.log "Yield - #{res}"
).catch (err) ->
  console.log "Error", err